Also running into this issue.

I think this is the same issue, if not I can split into my own. While using jest + typescript I can't import non-default exports from .vue files. Although, I have no issue doing this with other .ts files while running my standard build. The following example would produce: TS2614: Module '"*.vue"' has no exported member 'IMyComponent'. Did you mean to use 'import IMyComponent from "*.vue"' instead?

mycomponent.vue:

<template>
...
</template>
<script lang="ts">
export interface IMyComponent extends Vue {
  ...
};
export default Vue.extend({
 ...
});
</script>

mycomponent.spec.ts (compiles fine normal build, blows up when running jest):

import MyComponent, { IMyComponent } from "../mycomponent.vue";

someother.ts (compiles fine normal build):

import MyComponent, { IMyComponent } from "../mycomponent.vue";